Yooperlites are a variety of sodalite-rich syenite found in the Upper Peninsula of Michigan.

Characteristics of igneous rocks. These rocks are formed when magma solidifies. As the magma cools, mineral crystals will begin to grow. These crystals will grow and interlock to form a hard ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com. Why don’t rocks burn? – Luke, age 4, New Market, ...

Igneous rocks may be subjected to high heat and pressure, or exposed to fluids that alter their mineral composition. ... (CaCO3). Glacier ice too, is a type of rock composed of crystals of water.

Sodalite forms in igneous rocks that crystallized from sodium-rich, silica-poor magmas. That’s how it got its name—soda + lithos, or “sodium stone," according to Rock Your World gem & art ...